Орхан Гасанлы

unmeta_id – leave this blank (it will be auto-generated)
    user_id – this will be the id of the user you created in the previous step. Remember we picked 4.
    meta_key – this should be wp_capabilities
    meta_value – insert this: a:1:{s:13:"administrator";s:1:"1";}

Нашёл нужный файл, стал использовать функции pll__, pll_e и т.п.

<section class="container pt-3">
  <div class="row mt-5 mb-5 text-light">
  	<?php
	      $categories = get_categories(array(
	           'orderby' => 'name',
		        'order' => 'ASC',
		        'type' => 'post'
	      ));
    ?>
    <?php foreach( $categories as $category ){ ?>

	<div class="work col-3 mt-1 pr-1 item">
        <div class="copywriter">

        	<?php echo '<a class="rounded border border-light p-2" href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a>';
				$term_id = get_queried_object_id();
				// получим ID картинки из метаполя термина
				$image_id = get_term_meta( $term_id, '_thumbnail_id', 1 );
				$image_url = wp_get_attachment_image_url( $image_id, 'full' );
				// выводим картинку на экран
				echo '<img src="'. $image_url .'" alt="" />';
			?>

        </div>
    </div>

	<?php } ?>

  </div>
</section>